Which of the following is good conductor of electricity?

Concept:

Good and Bad Conductors of electricity

• Good Conductors are materials that allow an electric current to pass through them. 
  • Examples: Metals like copper, silver, etc are good conductors. Graphite is also a good conductor. 
  • They are used for making conducting wires. 
• Poor conductors are materials that do not allow an electric current to pass through them.
  • Examples: wood, diamond, plastic, pure water, etc. 
  • They are used to make switches, insulating covers, etc.

Pure water is a poor conductor of electricity. But when impurities are present in it, it may conduct electricity. 

Explanation:

• Pure water is a poor conductor of electricity. 
• Distilled water is pure water and hence poor conductor of electricity. 
• Tap water is not pure. It contains several other types of minerals and ions which conduct electricity. So, tap water is a good conductor of electricity. 
• The salt solution contains ions that conduct electricity, so the saltwater is a good conductor of electricity.

Therefore the correct option is Both tap and seawater.